Atomically resolved spin-dependent tunneling on the oxygen-terminated Fe3O4(111)

We employ spin-polarized STM to study the spin-dependent tunneling between a magnetite (111) sample and an antiferromagnetic tip through a vacuum barrier at room temperature. Atomic scale STM images show significant magnetic contrast corresponding to variations in the local surface states induced by...

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Bibliographic Details
Published in:Physical review letters 2004-07, Vol.93 (5), p.057201.1-057201.4
Main Authors: BERDUNOV, N, MURPHY, S, MARIOTTO, G, SHVETS, I. V
Format: Article
Language:English
Subjects:
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Condensed matter: structure, mechanical and thermal properties
Electronic transport in condensed matter
Exact sciences and technology
Physics
Solid surfaces and solid-solid interfaces
Spin polarized transport
Surface structure and topography
Surfaces and interfaces
thin films and whiskers (structure and nonelectronic properties)
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Summary:We employ spin-polarized STM to study the spin-dependent tunneling between a magnetite (111) sample and an antiferromagnetic tip through a vacuum barrier at room temperature. Atomic scale STM images show significant magnetic contrast corresponding to variations in the local surface states induced by oxygen vacancies. The estimated variations in tunneling magnetoresistance of 250% suggest that the spin-transport properties are significantly altered locally by the presence of surface defects.
ISSN:0031-9007
1079-7114
DOI:10.1103/PhysRevLett.93.057201